I am working out the logistics of online consent and assent for a study that involves downloading a smartphone app for data collection. One of the questions that keeps coming up is how we verify that parents aren't completing assent for their children and children aren't completing consent for their parents. The consent process will be fairly rigorous, involving videos, text and comprehension questions. Does anyone have suggestions for how to document that the appropriate people are completing consent and assent? Any advice would be welcome.